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Aiming to develop materials for construction of the set-up and electrode of high-temperature molten salt reactors, the effect of Al and Y on the high-temperature oxidation behavior of Ni-11Fe-10 Cu at 750 and 950 °C in air were investigated. The oxidation kinetics of Ni-11Fe-10 Cu alloy followed parabolic law at 750 °C without spallation and linear law at 950 °C with severe spallation, while that of Ni-11Fe-10Cu-6Al-3Y alloy followed parabolic law at 750 and 950 °C without spallation. The parabolic rate constant(k_p) of Ni-11Fe-10 Cu was smaller than that of Ni-11Fe-10Cu-6Al-3Y at 750 °C. The oxide scale formed on Ni-11Fe-10 Cu at 750 °C was composed of a CuO outer layer, a NiFe_2O_4 middle layer and a NiO inner layer. The oxide scale formed on Ni-11Fe-10Cu-6Al-3Y at 750 °C was also composed of the similar triplex layers in addition to an internal oxidation zone containing Al, Ni and Cu oxide and the microstructure of the scale changed with increasing temperature. Although the doping Al and Y could improve the adherence of oxide scale, it could aggravate the extent of internal oxidation. Based on the combination of X-ray diffraction(XRD), scanning electron microscopy/energy dispersive spectroscopy(SEM/EDX) analysis, the microstructure and growth mechanism of the multi-layer oxide scale was studied and the effect of doping Al and Y on the oxidation behavior of Ni-11Fe-10 Cu alloy was also discussed.
Aiming to develop materials for construction of the set-up and electrode of high-temperature molten salt reactors, the effect of Al and Y on the high-temperature oxidation behavior of Ni-11Fe-10 Cu at 750 and 950 ° C in air were investigated. The oxidation kinetics of Ni-11Fe-10Cu alloy followed by parabolic law at 750 ° C without spallation and linear law at 950 ° C with severe spallation, while that of Ni-11Fe-10Cu-6Al-3Y alloy followed by parabolic law at 750 and 950 ° C without spallation. The parabolic rate constant (k_p) of Ni-11Fe-10Cu was smaller than that of Ni-11Fe-10Cu-6Al-3Y at 750 ° C. The oxide scale formed on Ni-11Fe- 10 Cu at 750 ° C was composed of a CuO outer layer, a NiFe 2 O 4 middle layer and a NiO inner layer. The oxide scale formed on Ni-11Fe-10Cu-6Al-3Y at 750 ° C was also composed of the similar triplex layers in addition to an internal oxidation zone containing Al, Ni and Cu oxide and the microstructure of the scale changed with increasing temperature oping Al and Y could improve the adherence of oxide scale, it could aggravate the extent of internal oxidation. Based on the combination of X-ray diffraction (XRD), scanning electron microscopy / energy dispersive spectroscopy (SEM / EDX) analysis, the microstructure and growth mechanism of the multi-layer oxide scale was studied and the effect of doping Al and Y on the oxidation behavior of Ni-11Fe-10Cu alloy was also discussed.